NAME
    Date::Range - work with a range of dates

SYNOPSIS
      use Date::Range;

      my $range = Date::Range->new($date1, $date2);

      my $earliest = $range->start;
      my $latest   = $range->end;
      my $days     = $range->length;

      if ($range->includes($date3)) { ... }
      if ($range->includes($range2)) { ... }

      if ($range->overlaps($range2)) {
        my $range3 = $range->overlap($range2);
      }

      foreach my $date ($range->dates) { ... }

DESCRIPTION
    Quite often, when dealing with dates, we don't just want to know
    information about one particular date, but about a range of dates. For
    example, we may wish to know whether a given date is in a particular
    range, or what the overlap is between one range and another. This module
    lets you ask such questions.

METHODS
  new()
      my $range = Date::Range->new($date1, $date2);

    A range object is instantiated with two dates, which do not need to be
    in chronological order (we'll sort all that out internally).

    These dates must be instances of the correct object. See want_class()
    below.

  want_class
    The class of which we expect the date objects to be objects. By default
    this is Date::Simple, but this could be any other date class. See
    Time::Piece::Range for an example of a subclass that uses a different
    date class.

  start / end / length
      my $earliest = $range->start;
      my $latest   = $range->end;
      my $days     = $range->length;

    These methods allow you retrieve the start and end dates of the range,
    and the number of days in the range.

  equals
      if ($range1->equals($range2)) { }

    This tells you if two ranges are the same - i.e. start and end at the
    same dates.

  includes
      if ($range->includes($date3)) { ... }
      if ($range->includes($range2)) { ... }

    These methods tell you if a given range includes a given date, or a
    given range.

  overlaps / overlap
      if ($range->overlaps($range2)) {
        my $range3 = $range->overlap($range2);
      }

    These methods let you know whether one range overlaps another or not,
    and access this overlap range.

  gap
            my $range3 = $range->gap($range2);

    This returns a new range representing the gap between two other ranges.

  abuts
            if ($range->abuts($range2)) { ... }

    This tells you whether or not two ranges are contiguous - i.e. there is
    no gap between them, but they do not overlap.

  dates
      foreach my $date ($range->dates) { ... }

    This returns a list of each date in the range as a Date::Simple object.

AUTHOR
    Tony Bowden, based heavily on Martin Fowler's "Analysis Patterns 2"
    discussion and code at http://www.martinfowler.com/ap2/range.html

BUGS and QUERIES
    Please direct all correspondence regarding this module to:
    bug-Date-Range@rt.cpan.org

COPYRIGHT AND LICENSE
      Copyright (C) 2001-2006 Tony Bowden.

      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License; either version
      2 of the License, or (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.